How to Send HTTP POST Requests in .NET Using Different Methods?

.NET Send HTTP Post request

Introduction

In .NET, HTTP Post requested developers to send data to the server. This data can use a variety of formats, such as JSON, XML or form url encoding data. This article will comprehensively overview how to issue an HTTP post request in the .NET to explore different methods and provide code examples.

Method 1: Use httpclient (recommendation) **

httpclient is a recommendation method for HTTP requests in .NET, with high performance. It is available in most modern .NET versions and provided asynchronous operations.

Settings:

Post Request:

<code>private static readonly HttpClient client = new HttpClient();</code>

get request:

<code>var values = new Dictionary<string, string>()
{
    { "thing1", "hello" },
    { "thing2", "world" }
};

var content = new FormUrlEncodedContent(values);

var response = await client.PostAsync("http://www.example.com/recepticle.aspx", content);

var responseString = await response.Content.ReadAsStringAsync();</code>

Method 2: The third party library restsharp:

<code>var responseString = await client.GetStringAsync("http://www.example.com/recepticle.aspx");</code>

Flurl.http:

Method 3: httpwebrequest (not recommended) **

<code>var request = new RestRequest("resource/{id}");
request.AddParameter("thing1", "Hello");
request.AddParameter("thing2", "world");
var response = client.Post(request);
var content = response.Content; // 原始内容作为字符串</code>

httpwebrequest is an older method, and the performance is not as good as httpclient. For compatibility reasons, it is still supported. Post Request:

<code>var responseString = await "http://www.example.com/recepticle.aspx"
    .PostUrlEncodedAsync(new { thing1 = "hello", thing2 = "world" })
    .ReceiveString();</code>

Method 4: Webclient (not recommended) **

Webclient is another choice, but the efficiency is not as efficient as httpclient.

Post Request:

<code>string postData = "thing1=" + Uri.EscapeDataString("hello");
postData += "&thing2=" + Uri.EscapeDataString("world");
var data = Encoding.ASCII.GetBytes(postData);

request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";

using (var stream = request.GetRequestStream())
{
    stream.Write(data, 0, data.Length);
}</code>

Conclusion

.NET Send HTTP Post requests can use multiple methods. HTTPClient is the preferred method, and the third -party library provides other functions. For compatibility reasons, HTTPWEBREQUEST and WebClient can still be used, but it is recommended to use modern methods to obtain optimal performance and functions.

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